注意：页面分别拖拽一个FileUpload、Button1、Label1、GridView控件，并新建一个UploadedExcel文件夹
Default.aspx.cs代码：
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication2
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
delete();
}
protected void Button1_Click(object sender, EventArgs e)
{
OleDbConnection conn = new OleDbConnection();
OleDbCommand cmd = new OleDbCommand();
OleDbDataAdapter da = new OleDbDataAdapter();
DataSet ds = new DataSet();
string query = null;
string connString = "";
string strFileName = DateTime.Now.ToString("ddMMyyyy_HHmmss");
//string strFileName = Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName);
string strFileType = Path.GetExtension(FileUpload1.FileName).ToString().ToLower();
if (strFileType == ".xls" || strFileType == ".xlsx")
{
FileUpload1.SaveAs(Server.MapPath("~/UploadedExcel/" + strFileName + strFileType));
}
else
{
return;
}
string strNewPath = Server.MapPath("~/UploadedExcel/" + strFileName + strFileType);
if (strFileType.Trim() == ".xls")
{
connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
}
else if (strFileType.Trim() == ".xlsx")
{
connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strNewPath + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
}
query = "SELECT * FROM [Sheet1$]";
conn = new OleDbConnection(connString);
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
try
{
cmd = new OleDbCommand(query, conn);
da = new OleDbDataAdapter(cmd);
ds = new DataSet();
da.Fill(ds);
GridView1.DataSource = ds.Tables[0];
GridView1.DataBind();
Label1.Text = "读取成功";
}
catch (Exception ex)
{
Label1.Text = "读取失败";
Response.Write(ex);
}
finally
{
da.Dispose();
conn.Close();
conn.Dispose();
}
}
//定时任务
private void delete()
{
DirectoryInfo di = new DirectoryInfo(Server.MapPath("/UploadedExcel/"));
FileInfo[] fi = di.GetFiles("*." + "*");
DateTime dtNow = DateTime.Now;
foreach (FileInfo tmpfi in fi)
{
TimeSpan ts = dtNow.Subtract(tmpfi.LastWriteTime);
if (ts.Milliseconds > 100)
{
tmpfi.Attributes = FileAttributes.Normal;
tmpfi.Delete();
}
}
}
}
}
注意：FileUpload控件并不能直接获取到文件的绝对路径（IE6及以下除外），只能通过上传到服务器再进行数据加载，然后再删除
